By Josh Clark
Where do hands and fingers fall on the device? This question is the linchpin for every form factor this book examines, and the answer tells you how to design your layout for comfort and efficiency. Since we hold phones, phablets, and laptops very differently, it's no surprise that each of these touchscreen variations has its own UI needs.
Yet these devices also share many consistencies, especially in the crucial role of thumbs. Whether we’re tapping away at tiny phones or jumbo tablets, our thumbs do most of the walking. That fact helps us establish sturdy cross-device guidelines. This chapter looks at why the thumb is so important, and reveals fundamental “rules of thumb” based on how we grab screens of all sizes.
The smartphone is of course the device that we hold most. We stare at it for more than 20% of our waking hours, consulting it 221 times per day on average. Let’s start with that most familiar of gadgets.